Occasionally I get stuck with a folder icon in my taksbar that has no label, and when selected brings up a full blank screen that obscures everything, even the taskbar. Once it's up the only way out is to hit the Win key. It does not respond to left or right mouseclips and when highlighted in the taskbar also cannot be closed with a right mouse click. It also cannot be closed from the task manager because it does not show up there at all. Theories? Almost forgot, the true beauty of this is that any time I close or minimize any other open window the gray screen pops up. It goes away if I restert but I'd still like to know what it is.